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Fencer Vulns
high 7.5

CVE-2024-31309 in the critical feed json

Apache Traffic Server: HTTP/2 CONTINUATION frames can be utilized for DoS attack

published 2024-04-10 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-29205

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
94.6%
EPSS 94.6% chance of exploitation in 30 days, percentile 99.8%
public exploits
0
none known

Summary

HTTP/2 CONTINUATION DoS attack can cause Apache Traffic Server to consume more resources on the server.  Version from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.3 are affected.

Users can set a new setting (proxy.config.http2.max_continuation_frames_per_minute) to limit the number of CONTINUATION frames per minute.  ATS does have a fixed amount of memory a request can use and ATS adheres to these limits in previous releases. Users are recommended to upgrade to versions 8.1.10 or 9.2.4 which fixes the issue.

Patch / fix

  • apache traffic_server 8.1.10, 9.2.4
  • trafficserver Debian 12 9.2.4+ds-0+deb12u1

debian advisories DEBIAN-CVE-2024-31309

  • trafficserver9 Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 9.2.4-r0

alpine advisories ALPINE-CVE-2024-31309

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-31309 updated cvss 7.5

trafficserver: CONTINUATION frames DoS

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
23 mo ago

Exploit prediction

94.62% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Apache Software Foundation Apache Traffic Server
  • apache traffic_server

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.